The answer is a: 7x^2 + 13x + 4
To find the simplified version of 2x^2 + 5x + 4 + 5x^2 + 8x, just combine like terms. 2 and 5 make 7x^2, 5 and 8 make 13x, and 4 is a constant that stays the same. Put them in order of degree (exponent) largest to smallest. Tis makes 7x^2 + 13x + 4.